11-14-2004 10:27 AM - edited 03-13-2019 07:01 AM
Does anyone know how to use 2 PRI ports in the router to simulate a PSTN switch? Thanks
11-14-2004 03:05 PM
Sure. The key is who is providing the ISDN NNI.
!
controller T1 1/0
framing esf
linecode b8zs
cablelength short 133
pri-group timeslots 1-24
description PRI to Nortel
!
interface Serial1/0:23
description PRI To Nortel
no ip address
no logging event link-status
isdn switch-type primary-dms100
isdn incoming-voice voice
isdn protocol-emulate network <-- This turns the interface into the PRI NNI. Just configure the other (User) side without this command because user is default.
This is in an H.323 Flavor btw since you are providing a PRI Emulation Purposes. If you have an HDV2 with a 2MFT add on you can route calls with 4 ports. One port per CPE PRI and the other two PRI's using H323 pots dialpeers to route calls from one CPE to another. It worked great for my CCIE Voice studies.
If you need to make back to back PRI cables use these pinouts:
SIDE A SIDE B
Pin 1 to Pin 5
Pin 2 to Pin 4
Pin 4 to Pin 2
Pin 5 to Pin 1
When you do a sh isdn status on the PRI NNI Side you must expect to see that ******** Network Side Configuration ********* As seen below:
HMS_Gateway#sh isd st
Global ISDN Switchtype = primary-dms100
ISDN Serial1/0:23 interface
******* Network side configuration *******
dsl 0, interface ISDN Switchtype = primary-dms100
L2 Protocol = Q.921 L3 Protocol(s) = CCM-MANAGER
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 0 CCBs = 0
The Free Channel Mask: 0x807FFFFF
Number of L2 Discards = 0, L2 Session ID = 199
Let me know how this works for you or if you need more detailed configurations.
Mike
11-14-2004 05:32 PM
And also make the same changes on callmanager if its involved ,if it as an mgcp gateway that is One mgcp endpoint to be clock source as internal ,while the other as line ....
11-16-2004 12:20 PM
Thanks Mike
What I have currently are:
two pri NM in one router,I want this to be NNI
1 pri NM in the other two routers, I want them to be UNI so that I can make calls beween these two routers via the 2pri router. From your comments it looks it's working great.
Can they support MGCP also? Accordng to amansharma it works also.
Is the DMS100 only type switch supported on this solution?
Where do i define the phone number? on the dial-peer for all three routers ? Thanks
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